
'''
import os, re, time

class Util(ni.Component):
    pass


    



    

    

    

class Group(ni.Util):
    input = ni.List(itemtype=ni.Attribute())
    output = ni.List(itemtype=ni.Attribute(), depends=(input,)) 
    
    def prepare_update(self):
        self.output = []
    
    def compute_output(self):
        L = self.output._data
        L.extend(self.input)
        return L

    



class TreeOfFunctions(ni.Util):
    tree_fn = ni.Tree(item_type = ni.Function(args=("a",)), name="Functions Tree")
    
    
    
'''
 